. >> senior congressional correspondent dana bash, our guide, this week as we check on the key races. we have been following this race. it is already -- it long since has gotten personal. last night, kicked it up a notch. >> reporter: oh, my, sure did. i was in massachusetts doing a story on this race this summer and talked to both candidates. and it was already going to be an intense race. and it was already clear then that this -- these two -- let's be honest, these two people not only are they running against each other for a seat they don't seem to like each other. that was incredibly clear with the sound bite you just played, but also clear with this -- maybe the line of the night, which came from scott brown. listen. >> if you're going to comment on my record, i would at least have you refer to it -- >> excuse me. >> go ahead. >> i'm not a student in your classroom, please let me respond, okay? thank you. >> reporter: the back story there is not just the obvious, which is that was a zinger, but scott brown goes around calling her professor warren, trying to make her seem out of touch, a